Note: This API is now obsolete.
Represents a workflow queue.
Assembly: System.Workflow.Runtime (in System.Workflow.Runtime.dll)
Thetype exposes the following members.
|Dequeue||Removes and returns the object at the beginning of the .|
|Enqueue||Adds an object to the end of the .|
|Equals(Object)||Determines whether the specified object is equal to the current object. (Inherited from Object.)|
|Finalize||Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)|
|GetHashCode||Serves as the default hash function. (Inherited from Object.)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|MemberwiseClone||Creates a shallow copy of the current Object. (Inherited from Object.)|
|Peek||Returns the object at the beginning of the without removing it.|
|RegisterForQueueItemArrived||Registers a subscriber to the QueueItemArrived event.|
|RegisterForQueueItemAvailable(IActivityEventListener<QueueEventArgs>)||Registers a subscriber to the QueueItemAvailable event.|
|RegisterForQueueItemAvailable(IActivityEventListener<QueueEventArgs>, String)||Registers a subscriber to the QueueItemAvailable event.|
|ToString||Returns a string that represents the current object. (Inherited from Object.)|
|UnregisterForQueueItemArrived||Unregisters a subscriber to the QueueItemArrived event.|
|UnregisterForQueueItemAvailable||Unregisters a subscriber to the QueueItemAvailable event.|
This material discusses types and namespaces that are obsolete. For more information, see Deprecated Types in Windows Workflow Foundation 4.5.
Workflow queues are used to pass messages between a host or host services and activities in a workflow. Any activity can create a by calling WorkflowQueuingService::CreateWorkflowQueue, and a host, a service, or another activity can call Enqueue to add an item to that . You can subscribe to the QueueItemAvailable event to be notified when an item arrives on the . You can use Peek to examine an item at the beginning of the and Dequeue to remove an item from the . Each is associated with a WorkflowQueuingService that you can use to perform other management operations on the , such as deleting the queue. QueuingService exposes the WorkflowQueuingService associated with this .
The following code example demonstrates how you can create a by calling the WorkflowQueuingService::GetWorkflowQueue method. It also uses the Count property to determine whether any messages exist in the current queue. Finally, the code uses the Dequeue method to remove and return the first object in the queue.
This code example is part of the File Watcher Activity SDK Sample from the FileSystemEvent.cs file. For more information, see File System Watcher Activity.